Abstract
Bananas and plantains (Musa spp.) are among the world’s most important crops and are considered as a poor man’s crop in tropical and subtropical countries. For this reason, they play a very important role in tropical regions’ food security. Several pathogens throughout the tropical areas of the world have become a threat for production, including “black sigatoka” (Mycosphaerella fijiensis Morelet) which is the most damaging disease for Musa plantations in Cuba. It is present in all areas of the country, and it replaced “sigatoka disease” (Mycosphaerella musicola) as the main threat. Chemical control and cultural practices reduce damages, but they are not solving the problem. Genetic variations are the basic tools to develop new cultivars with better traits, such as tolerance against various environmental stresses, resistance against pests and diseases, and improved yield and quality. Tissue culture techniques offer the opportunity for variation induction, handling of large plant populations using established selection methods, and rapidly cloning selected variants. All these strategies can increase the efficiency of mutagenic treatments and subsequent screening of mutant materials. Somatic embryogenesis (SE) is also an excellent system for clonal propagation and mutation induction. The present chapter describes a protocol on how to use embryogenic cell suspensions (ECS) in plantain (Musa spp.) using both in vitro gamma irradiation and plant regeneration in order to achieve genetic improvement. The process involves a series of steps to properly select ECS for irradiation and the posttreatment handling for plant regeneration as well as mutant selection during acclimatization phase and under field conditions.
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1 Introduction
Bananas and plantains (Musa spp.) are important staple crops. Over 400 million people throughout tropical and subtropical areas of the developing countries depend on these crops as a major source of calories and as an important commodity for local and international trade. Several pathogens throughout the tropical regions have become a threat for banana and plantain (Musa spp.) production (Suprasanna et al. 2012). In Cuba, this is a high-priority crop as part of the national food system because of its ability to produce all year round, its high per capita consumption rate, and the diversity of its uses. However, the country faces persistent low yields which are mainly attributed to attacks of “black sigatoka” disease caused by the fungal pathogen Mycosphaerella fijiensis. Because of disease damages and poor-quality planting materials, plantains (AAB group) are being gradually replaced by other more resistant variants, such as cooking bananas of the ABB Musa group and tetraploid hybrids (López et al. 2013).
Breeding banana and plantain for resistance to diseases and pest is urgently needed by small-scale and commercial producers. However, these crops have very low clonal multiplication rates, and most of the commercial varieties are polyploid, with extremely poor seed production. These barriers impede sexual hybridization and consequently slow down genetic improvement of the crop (Bakry et al. 2009; Okole 2010). The heterozygotic status is expected to be Aa in loci of diploid cultivars, while the triploids of A genomic types can exist in either Aaa or AAa forms. For interspecific hybrids, the heterozygotic constitution could be AaB, Aab, AAb, ABb, aBb, or aBB. Mutation induction may uncover a recessive phenotype by mutating, inhibiting, or deleting the corresponding dominant allele (Jain and Swennen 2004).
The success of any in vitro mutagenesis programme depends on the establishment of reproducible in vitro plant regeneration procedures, optimization of mutagenic treatments, and efficient screening of the mutagenized populations for desired variations (Jain 2007; Xu et al. 2012). Somatic embryogenesis (SE) is an excellent system for clonal propagation and mutation induction. The fact that somatic embryos originate from a single cell prevents chimaeras among regenerated plants and makes them an ideal subject for mutagenesis (Jain 2010). It has been shown that somatic embryos arising from banana cell suspensions most “probably” have a single-cell origin (Roux et al. 2004). Thus, the main advantage of using the ECS for mutagenesis would be either in obtaining non-chimaeric populations or the quick dissociation of the chimaeric sectors if any (Roux et al. 2001).
1.1 Somatic Embryogenesis in Musa spp.
SE is a process in which bipolar structures resembling a zygotic embryo develop from a non-zygotic cell without vascular connections with the original tissue. It is an important system where multiplication can be done at enormous rates (Arnold et al. 2002). During their development, SE passes through four consecutive phases: (1) induction of SE, (2) somatic embryo formation, (3) maturation of somatic embryo, and (4) somatic embryo germination and conversion into viable plantlets (Parrott 1993).
SE is a promising method for the establishment of protocols reaching rapid multiplication of new and elite genotypes and synthetic “seed” production. In vitro selection uses various biotic and abiotic stresses in order to study genetic manipulation (Kamle et al. 2011). In Musa, SE has been obtained by different ways. They include cultures of zygotic embryos (Cronauer and Krikorian 1988; Escalant and Teisson 1988), leaf tissues and rhizome (Novak et al. 1989a), highly proliferating meristems (Dhed’a et al. 1991; Schoofs 1997), male inflorescences (Ma 1991; Escalant et al. 1994), and female inflorescences (Grapin et al. 1998). The most successful explants were the proliferating meristems and male inflorescences. They allow for the establishment of ECS, the formation of somatic embryos, and their subsequent conversion into plants that undergo field evaluation (Strosse et al. 2003; Aguilar et al. 2008).
Although SE in banana is now a well-established method (Strosse et al. 2003; Aguilar et al. 2008), the initiation of a “genotype-independent” embryogenic cell culture is still far from routine (Schoofs et al. 1999; Kulkarni et al. 2007). It is difficult to have an efficient and repeatable protocol for all Musa genomic groups. López (2006) developed a protocol for plantain cultivars that do not have the male inflorescence (Horn and Pseudo-horn type). This protocol is based on the use of shoot apices (explant) from the multiplication of the axillary buds in the presence of ancymidol (0.2–0.4 mg l−1 depending on the cultivar). It also relies on the somatic embryos’ ability to achieve differentiation in semisolid and liquid culture media. The use of shoot apices of axillary buds to induce ECS in AAB group plantain cultivars in Cuba prompted the scaling up of propagation by SE to biofactories (commercial laboratories) that are being established as an alternative for clonal propagation (López et al. 2013) and its application in the banana genetic improvement programme by mutations (López et al. 2007; Sales et al. 2013).
1.2 Mutation Induction in Musa spp.
Biotechnology, while making use of both mutagenesis and conventional methods, can assist in overcoming hurdles during the development of new and improved banana cultivars for sustainable fruit production. This in turn improves the socioeconomic status of growers (Jain and Maluszynski 2004). The most commonly used mutagens so far are physical mutagens such as gamma rays (Roux 2004). The Musa mutation induction system based on in vitro techniques to obtain mutant plants and micropropagate desirable mutants was developed by Novak et al. (1989b). Later, Roux (2004) standardized the methodology to provide guidelines to mutation induction programmes in Musa spp. Shoot tips were excised from clones representing different genomic constitutions of the genus Musa. Later, they were treated with ten doses from 10 to 100 Gy of a cobalt-60 source at a dose rate of 44 Gy/min. Radiation sensitivity and postirradiation recovery were assessed by measuring survival rate, propagation rate, shoot height, and fresh weight. The different Musa accessions showed different responses depending on the ploidy level and genomic constitution. The following ranges of doses were recommended: 10–20 Gy for diploid cultivars (AA and BB), 30–40 Gy for triploid cultivars (AAA and AAB), and 40–50 Gy for triploid cultivars (ABB) (Roux 2004).
In vitro mutagenesis of multicellular meristems of Musa spp. can lead to a high degree of chimaerism. The regenerated mutant plants will be potentially unstable in regard to cellular genotypes and expressed phenotypes due to segregation in subsequent vegetative propagated generations. Interestingly, data from chemical mutagenesis of triploid bananas suggests that chimaerism can be quickly resolved and may not be an issue in some cases (Jankowicz-Cieslak et al. 2012). Similar data is not available for gamma irradiation, and therefore several rounds of subculturing are advised to remove chimaeras (see Chap. 3 for more on chimaera dissolution in banana). Once subculturing is completed, the rooted plantlets are weaned in the greenhouse and planted in the fields for evaluation (Kulkarni et al. 2007).
The main advantage of using the ECS for in vitro mutagenesis treatment is the instant production of non-chimaeric populations or the quick dissociation of the chimaeric sectors if they are found. Using this process can therefore increase the efficiency of mutagenic treatments (Roux et al. 2001). There are only a few available reports on gamma irradiation for ECS in Musa spp. (López et al. 2007; Roux 2004; Kulkarni et al. 2004). The time at which the cells are irradiated is very critical, according to Roux et al. (2004) and Kulkarni et al. (2007). The optimal timing for irradiation is considered to be 4–6 days after subculture because at this time the majority of cells are in the G1 phase. One of the most important steps in mutagenesis experiments is to determine the appropriate dose. Theoretically, LD50 will cause the highest frequency of mutations (Van Harten 1998). Studies on irradiated embryogenic cell suspension from cultivars “CEMSA ¾” (AAB) and “Calcutta 4” (AA) showed that the LD50 should be calculated during the embryo germination stage (sprouts and roots emission) (López et al. 2007; Sales et al. 2013).
The irradiated ECS survival has been too high and variable. Roux et al. (2004) stated that the ECS of cultivars “Williams” and “Three Hand Planty” grew even at a very high dose of 250 Gy. Kulkarni et al. (2004) observed that a 40 Gy dose in cv. “Gran Nain” was completely lethal. Due to the higher hydration levels, the ECS were more radiosensitive. However, previous reports indicate that gamma irradiation at approximately 70 Gy was completely lethal to the shoot-tip multiples.
When searching for a desired trait, mutation induction protocols should aim to increase the degree of plant’s genetic diversity within the resulting plant population. In order to accomplish this goal, it is necessary to continue integrating the gamma ray mutagenesis processes with selection of in vitro cell lines or tissue cultures using a selection agent (e.g. a medium with a high concentration of salt or phytotoxin). The present chapter describes a protocol for plant regeneration from ECS in plantain (Musa spp.) and its use for in vitro mutagenesis.
2 Materials
2.1 Explant Preparation: Shoot-Tip Establishment and Multiplication
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1.
Donor plants for in vitro establishment (culture initiation). Materials used for this protocol were taken from the germplasm bank with previous characterization by descriptors for banana Musa spp. (INIBAP 1996).
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2.
Semi-controlled growth environment (shade or screen house).
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3.
Detergent dish soap in water (20 g for 100 explants).
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4.
Sodium hypochlorite (NaOCl) 2.5 and 3 % in water.
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5.
Laminar airflow cabinet.
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6.
Dissecting instruments (scalpels with removable blades and forceps).
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7.
Culture tubes (150 × 25 mm).
2.2 Culture Medium and Incubation Materials
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1.
Murashige and Skoog mineral salts (MS) (Murashige and Skoog 1962) (see Note 1 and Table 4.1).
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2.
Balance.
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3.
pH meter.
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4.
Autoclave.
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5.
Culture tubes (150 × 25 mm).
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6.
Petri dishes (80 × 15 mm).
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7.
Erlenmeyer flasks (10 and 100 ml).
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8.
Plastic mesh with 100 μm holes.
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9.
Temporal immersion system, type Rita® of 500 ml capacity.
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10.
Laminar airflow cabinet.
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11.
Dissecting instruments (scalpels with removable blades, and forceps).
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12.
Stereo microscope and inverted microscope.
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13.
Rotary shaker (70–100 rpm).
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14.
Growth chamber or a windowless room with environmental control. Specific details for culture room conditions in each stage of the protocol are given in Table 4.2 (see Note 2).
2.3 Acclimatization
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1.
Regenerated plantlets
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2.
3.5 l black polyethylene bags (15 cm diameter, 20 cm high)
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3.
Substrates: filter press mud or soil to compost mixture (1:1 v/v)
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4.
Urea
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5.
Acclimatization phase
2.4 Mutation Induction Using Gamma Irradiation
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1.
Cobalt-60 source
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2.
Embryogenic cell suspensions
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3.
1000 μm pore-size mesh
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4.
2.0 ml Eppendorf plastic tubes
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5.
Petri dishes (80 × 15 mm)
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6.
Culture tubes (150 × 25 mm)
3 Methods
3.1 Explant Preparation: Shoot-Tip Establishment and Multiplication
3.1.1 Shoot-Tip Establishment
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1.
Remove “sword” suckers between 25 and 30 cm in height from healthy flowering donor plants.
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2.
Grow material under semi-controlled conditions for 45–60 days until vigorous and healthy-looking suckers of 15–25 cm in height with a corm diameter of about 10 cm are observed. Also, smaller buds (sleeping eyes) on the corm can be used as explants for tissue culture initiation as an alternative to increase the seed volume at the initial stage.
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3.
Remove leaf sheaths from the corm to obtain 4–5 cm diameter sections enclosing the vegetative apex. Wash the tissue cubes under running tap water.
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4.
Rinse four times with detergent (20 g by 100 explants) and disinfect explants with sodium hypochlorite (3 %) plus 4 ml ethanol (95 %) for 20 min. Swirl the solution frequently (see Note 3).
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5.
Decant the hypochlorite solution. Rinse explants three times during 3–4 min with sterile deionized water and decant.
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6.
Explants are reduced to 2.5–3 cm high with a square base of about 1.5 cm and transfer (the explants) to a laminar airflow cabinet followed by a second disinfection for 10 min with 2.5 % NaOCl. Decant the hypochlorite solution and wash explants three times with sterile distilled water.
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7.
Apices are reduced to a rectangular shape of 1.0 × 0.5 cm and are inoculated in culture tubes containing 10 ml of establishment culture medium for 15–18 days (Tables 4.1 and 4.2) (López 2006).
3.1.2 Shoot-Tip Multiplication
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1.
First subculture: The shoot tips are cut longitudinally through the apex after in vitro establishment period (15–18 days) and are inoculated in culture tubes containing 10 ml multiplication culture medium for 21–30 days.
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2.
Second subculture: Shoot tips are decapitated from 2 to 3 mm from the corm base, and sprouts smaller than 15 mm are not separated from each other and are not decapitated. They are inoculated in culture tubes containing 10 ml multiplication culture medium for 21–30 days. At this stage, shoot-tip multiplication is stimulated through multiple subcultures to obtain shoot proliferation.
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3.
Third subculture: Multiplication is followed as in the second subculture. Through repeated subcultures, the multiplication of propagules follows an exponential increment pattern until the desired number of propagules is reached. From this subculture, shoot tips are used for inducing SE process.
3.2 Protocol for Plant Regeneration via Somatic Embryogenesis
This protocol involves a series of sequential stages: obtaining explants (multiplication of shoot-tip cultures, see Sect. 4.3.1); callus formation with embryogenic structures; establishment and multiplication of ECS; formation, maturation, and germination of embryos (Tables 4.1 and 4.2); conversion to plants; and field evaluation (López 2006) (Fig. 4.1).
3.2.1 Callus Formation with Embryogenic Structures
Shoot tips are excised from axillary buds (2–3 mm) with the aid of a stereoscopic microscope for callus formation with embryogenic structures. They are incubated in culture tubes with 10 ml of culture medium for callus formation during 3–8 months (see Note 4).
3.2.2 Establishment and Multiplication of Embryogenic Cell Suspensions
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1.
Use proembryos and embryos in the globular stage obtained from callus with embryogenic structures [0.08–0.1 g fresh weight (gFW)] to establish ECS. Incubation is performed in 10 ml Erlenmeyer flask with 2–3 ml of suspensions culture medium (Santos et al. 2002). Media renewals (50 %) are carried out every 3 days to eliminate the presence of non-embryogenic cell aggregates and died cells. Cultures are placed on an orbital shaker at 90 rpm.
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2.
After 20–30 days, cellular cultures formed are sieved through filters of 500 μm metallic mesh. At this moment homogeneous cell suspensions are formed.
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3.
The multiplication of ECS is carried out at 3 % settle cell volume (SCV) and subcultured each 15 days. Incubation is performed in 100 ml Erlenmeyer flasks (López 2006; López et al. 2005a) (see Note 5). Culture media and culture conditions are similar to those applied in the establishment of ECS.
3.2.3 Formation of Somatic Embryos
ECS from the exponential or linear growth phase is used for somatic embryos formation in semisolid or liquid culture media:
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1.
Somatic embryo formation in semisolid culture media is obtained by incubating a drop of ECS on Petri dishes. ECS have been previously diluted in 25 % SCV. Four 100 μm pore-size plastic meshes are placed on each Petri dish. Each mesh has a 1 cm2 size to four one cell drop at 25 % SCV incubate during a 4–6 weeks period.
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2.
For somatic embryos formation in liquid culture medium SCV is adjusted to 12 %. Keep culture for 4–6 weeks. Culture medium is renewed every 15 days.
3.2.4 Maturation of Somatic Embryos
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1.
Maturation of somatic embryos in semisolid culture media
Embryogenic mass portions (0.3–0.4 mm) from somatic embryos in the globular stage form in semisolid culture media and are incubated during a month on Petri dish for somatic embryos maturation.
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2.
Maturation of somatic embryos in liquid culture media
In order to obtain matured somatic embryos: 0.5 gFW of somatic embryos from the globular stage in liquid culture media are incubated on 30 ml of maturing culture medium in 100 ml Erlenmeyer flask during a month. Culture medium is renewed after 15 days of culture.
3.2.5 Germination of Somatic Embryos
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1.
Germination of somatic embryos in semisolid culture media
Mature somatic embryos with visible invagination at a stereo microscope are incubated for a month on Petri dish containing semisolid culture medium for somatic embryo germination.
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2.
Germination of somatic embryos in temporal immersion system, type Rita® (see Note 6)
The temporal immersion system, type Rita® [developed by Teisson and Alvard (1995) with 200 ml culture medium for germination], is used for germination of somatic embryos according to López (2006). The immersion frequency was three times daily, during 1 min each according to Escalant et al. (1994). For every temporal immersion system, use an inoculant density of 0.5 g fresh weight of somatic embryo (gFW). Incubate during a 25–30 days period.
3.2.6 Acclimatization Phase of Somatic Embryos, Conversion into Plants
In order to carry out somatic embryo conversion into plants, the following conditions must be guaranteed for plantlets coming from in vitro:
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1.
Keep relative humidity above 80 % within the first 10 days after transplanting to acclimatization phase.
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2.
Protect plants from direct sunlight incidence with zaran to allow light intensity of 600 μmol m−2 s−1. Gradually, these conditions must be reduced to achieve full plant adaptation to field conditions.
For somatic embryos conversion into plants, the following procedures are followed:
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1.
Plantlets are removed from the culture vessel.
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2.
Wash the plantlets carefully to remove residual culture media and separate them into individual plants. Classify plants by size for planting (large: more than 5 cm high; medium: 3–5 cm; and small: less than 3 cm).
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3.
Transplant plantlets into polyethylene bags containing filter press mud or soil compost mixture (1:1 v/v).
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4.
Fertilize with foliar urea 5 g l−1 after 15 days and every 7 days until transplanting to field conditions.
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5.
Plantlets are kept in the acclimatization phase for 45–60 days until they reach a height of around 15 cm. At this time, they are suitable to plant out in the field.
3.3 Mutation Induction Using Gamma Irradiation
Mutation induction is achieved by exposing ECS to gamma irradiation. Mutant selection occurs both during the acclimatization phase and under field conditions (López et al. 2007; Sales et al. 2013) (Fig. 4.2). The whole process for irradiation of ECS is detailed below:
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1.
Selected ECS with stable growth and proven ability to regenerate plants are taken 4 days after subculture and are sieved through 1000 μm pore-size mesh.
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2.
Add 0.4 ml cells to each 2.0 ml Eppendorf plastic tubes (three per each irradiation dose) to irradiate using a cobalt-60 gamma source (0–100 Gy, in steps of 10 Gy).
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3.
Incubate irradiated ECS and the nonirradiated control in semisolid medium for somatic embryos formation during 30–40 days.
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Incubation of each treatment to promote somatic embryo formation occurs as follows: Each Eppendorf plastic tube contains four plantings coming from a single Petri dish. Each study treatment includes three Eppendorf tubes with a total of three Petri dishes per treatment.
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4.
Transfer somatic embryos formed to a semisolid maturing medium for somatic embryos maturation. Keep them in maturing medium for 30 days.
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5.
Transfer matured somatic embryos to a semisolid medium in order to promote germination. Keep them in semisolid medium for 30 days. At this stage, calculate the LD50 for germinated embryos (see Note 7).
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6.
Transfer germinated embryos (plantlets) to the acclimatization phase to promote plant conversion. Survival of plantlets from irradiated ECS and phenotypic changes are evaluated and compared with plantlets obtained from nonirradiated ECS (control) according to the methodology proposed by Sandoval et al. (1997) and López et al. (2005b).
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The following parameters are tested 60 days after transplantation:
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Survival rate
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Plant height (cm)
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Petiole length of the second leaf (cm)
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Length of the second leaf (cm)
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Width of the second leaf (cm).
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Distance between the second and third leaf (cm)
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7.
Transfer plantlets from irradiated ECS, plantlets from nonirradiated ECS (control), and corm buds (also as control) to field conditions in order to evaluate the resulting variability and possible mutants according to Sandoval et al. (1997) and López et al. (2005b).
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The following parameters are tested 6 months after planting and during harvest:
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Pseudostem circumference at a meter height (cm)
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Plant height (cm)
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Number of active leaves
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Flowering date (weeks)
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Number of fingers/bunch
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Number of hands/bunch
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Bunch weight
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Length of the central finger in the second hand (cm)
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Length of the central finger in the next to the last hand (cm)
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Length of the central finger in the last hand (cm)
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Incidence of “black sigatoka” at the flowering time according to some criterions for the Technical Guidelines 7 from INIBAP (Carlier et al. 2003).
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8.
Multiply and evaluate possible mutants selected from the first cycle during a second field crop (INIBAP 1996).
4 Notes
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1.
Mineral salts from Murashige and Skoog medium (Murashige and Skoog 1962) are very suitable for banana and plantain shoot-tip culture and SE (Table 4.1). Culture media are prepared by dissolving all media components in a flask with distilled water. pH values are adjusted to 5.8 in all media by using HCl and KOH. For medium solidification, 2300 mg l−1 of Phytagel is added to and dissolved in the medium by heating it on the stirring/hot plate. The medium is dispensed into tissue culture vessels, and then it is sterilized for 15–30 min depending on the size of culture vessels (121 °C × 1.2 kg cm−2).
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2.
A windowless room having a controlled environment is necessary to keep in vitro cultures. An air conditioning unit is suitable for temperature control, and the photoperiod is also controlled with artificial lighting.
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3.
It is important to have enough active substance, capable of reacting with the surface of the vegetable material. To accomplish this, the amount of NaOCl added for disinfection needs to be two to three times higher than the number of apices disinfected.
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4.
The formation of embryogenic cultures is observed after 3 months. It is characterized by yellow meristematic globules (nodular calli) with and without embryo formation in the meristematic globule surface similar to those described by Dhed’a et al. (1991) and Schoofs (1997).
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5.
During the multiplication stage, cell suspensions are characterized by many spherical cells in active division. Cell aggregates might be heterogeneous, irregular, translucent, and non-translucent. The abovementioned cell characteristics are considered indicators of embryogenic conditions for cell suspensions (Dhed’a et al. 1991).
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6.
Temporal immersion system shows better performance than semisolid culture media (Escalant et al. 1994; López 2006).
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7.
LD50 calculations are preferably completed during the germination phase due to the low synchronization of the plant regeneration system during embryo histodifferentiation (López et al. 2007). It is also important to consider that the closest irradiation dose (lower and upper) to the LD50 is more likely to produce favorable mutants (Kulkarni et al. 2007).
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Acknowledgements
Funding for this work was provided by the Food and Agriculture Organization of the United Nations and the International Atomic Energy Agency through their Joint FAO/IAEA Programme of Nuclear Techniques in Food and Agriculture through Research Contract No.15503 of IAEA Coordinated Research Project D24012, and from “Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear” (CEADEN) in Cuba. We thank profusely Dr. Brad Till and Dr. Chikelu Mba for their valuable suggestions and help and to technicians Nery Montano and Damicela Reinaldo for their significant contribution to the protocols described here.
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López, J., Rayas, A., Santos, A., Medero, V., Beovides, Y., Basail, M. (2017). Mutation Induction Using Gamma Irradiation and Embryogenic Cell Suspensions in Plantain (Musa spp.). In: Jankowicz-Cieslak, J., Tai, T., Kumlehn, J., Till, B. (eds) Biotechnologies for Plant Mutation Breeding. Springer, Cham. https://doi.org/10.1007/978-3-319-45021-6_4
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